The 13 Ghosts of Scooby-Doo
Vincent Van Ghoul tried to transport Scooby-Doo away to safety from Time Slime, but the time scepter Scooby was holding at the time only knocked him into a time vortex. The time scepter then showed him his birth. This was followed by more recent events, such as when he first opened the Chest of Demons, releasing the monsters out. This trauma caused Scooby to quit the team, and moved back home to live with his parents. But when the gang gets captured by Time Slime Vincent Van Ghoul visits Scooby and shows him what will happen if he doesn't come back.